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Starting a quick thread to track the different engines on the #Tianhe-1 module of the CSS (feel free to comment if smth. is missing!)
Let's first start with the fact that Tianhe-1 is equipped with 30 thrusters, of which 26 are chemical thrusters, and 4 are Hall Effect thrusters.
Let's first start with the fact that Tianhe-1 is equipped with 30 thrusters, of which 26 are chemical thrusters, and 4 are Hall Effect thrusters.
Most thrusters are situated on the non-pressurized propulsion compartment at the very back of the Tianhe-1: a compartment that has a diameter of 4.2m & a height of 2.1m. This area is literally full of propellant! Its dry mass is 487 kg, but weighs 4.3 tons once fueled up... 
Among these 26 thrusters, 4 are larger orbital control thrusters, which are very visible on pictures. They have an angle of inclinaison with the axis of the Tianhe-1, presumably to avoid having the thrust affect the core module exterior wall.
